Seven years after ZIRP (then NIRP) was launched and central banks grew their balance sheets by $13 trillion, in the process inflating the biggest bubble the world has ever seen, sending risk prices to record highs and trillions in government debt to record negative yields, first the Fed admitted QE was a mistake, and now the investment banks – especially those who were bailed out and were the biggest beneficiaries of QE such as Citigroup – admit central ba